Dr. William Bayer, MD

Dr. William Bayer, MD

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Endocrinology, Diabetes & Metabolism  ·  
Male  ·  
58 y/o
(28)

Accepting new patients

Dr. William Bayer, MD is an endocrinology, diabetes & metabolism specialist in Carol Stream, IL and has been practicing for 33 years. He specializes in endocrinology, diabetes & metabolism and internal medicine.
NEW PATIENTS
(630) 326-4436
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Northwestern Medicine Regional Medical Group

501 Thornhill Dr

Carol Stream, IL 60188
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New Patients
(630) 326-4436
Existing Patients
Show Number

Insurance Accepted

  • Aetna
  • Blue Cross Blue Shield of Illinois
  • Cigna
  • Cigna-HealthSpring
  • CorVel
  • Coventry Health Care
  • First Health (Coventry Health Care)
  • HealthLink
  • HFN
  • Humana
  • LifeSynch
  • Medicaid
  • MultiPlan
  • UniCare
  • + 2 More

Background Check

No malpractice claims found for Illinois
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
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Experience Check

Check Dr. Bayer's experience treating your condition or procedure

Dr. Bayer's Top Procedures and Conditions

Treatment Frequency
Vitamin D Deficiency
very high
very high

Treatment Frequency

Dr. Bayer treats Vitamin D Deficiency more than 100% of his peers

Dr. Bayer treats this condition more than 100% of his peers

Learn more about Vitamin D Deficiency
Hypothyroidism
very high
very high

Treatment Frequency

Dr. Bayer treats Hypothyroidism more than 100% of his peers

Dr. Bayer treats this condition more than 100% of his peers

Learn more about Hypothyroidism
Thyroid Disease
very high
very high

Treatment Frequency

Dr. Bayer treats Thyroid Disease more than 100% of his peers

Dr. Bayer treats this condition more than 100% of his peers

Learn more about experience ratings

Dr. Bayer's conditions and procedures:

  • Abnormal Thyroid
  • Acromegaly and Gigantism
  • Adrenal Gland Diseases
  • Adrenal Incidentaloma
  • Adrenal Insufficiency
  • Autoimmune Diseases
  • Autoimmune Thyroid Diseases
  • Benign Tumor
  • Bone Disorders
  • Breast Diseases
  • Calcium Metabolism Disorders
  • Cancer
  • Congenital Adrenal Hyperplasia (CAH)
  • Continuous Glucose Monitoring
  • Cushing's Syndrome
  • Diabetes Counseling
  • Diabetes Insipidus
  • Diabetes Mellitus, Secondary
  • Diabetes Type 1
  • Diabetes Type 2
  • Diabetes With Renal Manifestations
  • Diabetic Ketoacidosis
  • Female Infertility
  • Gestational Diabetes
  • Goiter
  • Graves' Disease
  • Growth Hormone Deficiency
  • Gynecomastia
  • Hashimoto's Disease
  • Hypercalcemia
  • Hyperkalemia
  • Hyperlipidemia
  • Hyperparathyroidism
  • Hyperthyroidism
  • Hypoglycemia
  • Hypokalemia
  • Hypoparathyroidism
  • Hypopituitarism
  • Hyposmolality and Hyponatremia
  • Hypothyroidism
  • Kidney Disease
  • Lipid Disorders
  • Malaise and Fatigue
  • Menstrual Disorders (incl. Dysmenorrhea)
  • Multiple Endocrine Neoplasia
  • Obesity
  • Osteopenia
  • Osteoporosis
  • Overweight
  • Pregestational Diabetes Mellitus
  • Pregnancy-Related Disorders
  • Symptomatic Menopause
  • Testicular Dysfunction
  • Thyroid Cancer
  • Thyroid Cyst
  • Thyroid Disease
  • Thyroiditis
  • Vitamin D Deficiency

About Me

Care Philosophy

"Better people means better experiences. Our care team is committed to delivering results that change lives." 

Specialties

  • Endocrinology, Diabetes & Metabolism
  • Internal Medicine

Board Certifications

  • Diabetes, Metabolism & Endocrinology
  • Internal Medicine
Learn why a board certification matters

Education

Loyola University Medical Center
Fellowship Hospital
Loyola University Medical Center
Residency Hospital
Loyola University Medical Center
Internship Hospital
1986
Loyola University of Chicago / Stritch School of Medicine
Medical School
1986

Awards

  • Healthgrades Honor Roll
Learn more about recognized doctors

Dr. Bayer's Reviews

Likelihood to recommend Dr. Bayer

3.5

Based on 28 reviews

5 Stars
60.714285714285715%
(17)
4 Stars
0%
(0)
3 Stars
3.5714285714285716%
(1)
2 Stars
3.5714285714285716%
(1)
1 Star
32.142857142857146%
(9)

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Dr. Bayer?
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Average Wait Time
  • 10 – 15 minutes
Dr. Bayer's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
What People Say About Dr. William Bayer, MD
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Dr. Bayer is an excellent and outstanding Endocrinologist. I have been seeing him for over 20 years. He's very thorough and explains things to you. He takes his time and listens to you. He's very friendly and he has a great sense of humor. He's the best Endocrinologist around and I would recommend...Read More
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Dr. Bayer has always listened to my symptoms, not just bloodwork results. When the tests he ran came back normal, but my symtpoms said otherwise, he ran more tests until he figured out what was wrong. When my prognosis wasn't great, he personally called me to go over the results and then followed...Read More
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Dr. Bayer is a Diabetic Endocrinologist that I have complete trust in has really turned my A1C Goal/Goals to the Positive. He is very knowledgeable in his field and he always spends appropriate time w/patient/patients. I will be 62 in December and have been battling Diabetes since 1999/2000. He has...Read More
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Do not take the bad reviews seriously! Dr. Bayeris amazing & caring! So, if you need a really good doctor that cares about your health & does not set a timer when you walk in, he is your answer to getting your health back on track! I came to him when there was no one else. He cared & I am now on...Read More
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Dr Bayer is a no-nonsense doctor that is very knowledgable and thoruough. I have gone to him for many years before a car accident and am now able to see him again. I could not find his phone number so I looked it up. As I read the reveiws that were positive, I could relate. As I read the...Read More
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Locations

Insurance accepted

Accepted insurance can change. Please double-check when making an appointment.

Aetna
Aetna EPO
Aetna POS
Aetna PPO
Managed Choice POS
Open Choice PPO
Blue Cross Blue Shield of Illinois
Blue Advantage
Blue Cross Blue Shield of Illinois HMO
Blue Cross Blue Shield of Illinois PPO
Blue Precision HMO
Cigna
Great West Healthcare-Cigna HMO
Great West Healthcare-Cigna POS
Great West Healthcare-Cigna PPO
Cigna-HealthSpring
CorVel
Worker's Compensation WC
Coventry Health Care
Coventry Health Care HMO
Coventry Health Care POS
Coventry Health Care PPO
First Health (Coventry Health Care)
HealthLink
HealthLink HMO
HealthLink POS
HealthLink PPO
HFN
HFN PPO
Worker's Compensation WC
Humana
Choice
Choice Care
Choice PPO
Humana HMO
Humana POS
Humana PPO
LifeSynch
Behavioral Health
Medicaid
MultiPlan
MultiPlan PPO
PHCS Network PPO
UniCare
UniCare HMO
UniCare POS
UniCare PPO
UnitedHealthCare
Choice
Choice Plus
United Behavioral Health
United Healthcare EPO
United Healthcare HMO
United Healthcare POS
United Healthcare PPO
Viant

Affiliated Hospitals

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